How to Fix a Leaking Faucet: 9 Common Causes and Washer Replacement

Author : Restaurant Equipment | Published On : 24 Feb 2026

A leaking faucet is more than a minor inconvenience—it wastes significant amounts of water, raises monthly utility expenses, and can eventually lead to costly plumbing damage if ignored. In commercial environments, even a slow, consistent drip may accumulate into hundreds of gallons of wasted water annually. In many cases, deteriorated or improperly fitted faucet washers are the primary cause of ongoing leakage, particularly in high-use facilities where fixtures are used repeatedly throughout the day and experience accelerated wear.

Identifying the exact cause of a faucet leak allows facility managers and maintenance teams to take prompt, cost-effective corrective action. Whether performing a complete faucet washer replacement or selecting the appropriate faucet washer types for specific fixtures, proper assessment is essential. Using reliable faucet washers tools ensures precise installation and reduces the risk of recurring problems.

This guide details seven common causes of leaks and outlines practical repair steps using dependable faucet repair parts to maintain long-term plumbing efficiency and performance.

Worn-out Washer Causing Continuous Faucet Dripping

One of the most common causes of a dripping faucet is a worn-out washer. Over time, constant friction between the washer and valve seat causes it to flatten, crack, or harden. This wear prevents a tight seal, allowing water to seep through even when the handle is fully closed. Older compression faucets are especially prone to washer deterioration due to repetitive mechanical pressure during operation.

How to Fix:

Turn off the water supply before disassembly.
Remove the handle and unscrew the stem assembly carefully.
Inspect the existing washer for cracks or flattening.
Select the correct size from available faucet washer types.
Perform faucet washer replacement using compatible faucet washers tools.
Reassemble tightly and test for remaining drips.

Damaged O-ring Leaking Around Handle Area

If water leaks around the handle instead of the spout, a damaged O-ring is often responsible. The O-ring seals the stem to prevent water from escaping through the handle assembly. Over time, rubber components degrade due to pressure fluctuations, mineral deposits, and temperature changes. When compromised, the O-ring allows water to escape during faucet use.

How to Fix:

Shut off the water supply and remove the faucet handle.
Extract the stem to access the O-ring location.
Inspect for cracks, brittleness, or stretching damage.
Replace with a matching O-ring from faucet repair parts kits.
Apply plumber’s grease for smoother operation and longer lifespan.
Reassemble and confirm leak elimination.

Corroded Valve Seat From Mineral Buildup

The valve seat connects the faucet to the spout and acts as a compression surface for the washer. Hard water minerals often accumulate here, leading to corrosion or pitting. When the valve seat becomes uneven, it prevents proper sealing—even after faucet washer replacement. Corrosion gradually worsens, causing recurring leaks and washer damage.

How to Fix:

Turn off water and remove the faucet stem assembly.
Inspect the valve seat for mineral deposits or corrosion.
Use a valve seat wrench among essential faucet washers tools.
Clean minor buildup using a descaling solution.
Replace severely corroded seats with compatible faucet Repair Parts.
Install new faucet washers and test for proper sealing.

Loose Internal Parts Causing Water Leakage

Loose packing nuts, stems, or retaining screws can allow water to escape through small internal gaps. Vibrations, frequent use, or improper installation may cause internal components to shift. Even slight looseness disrupts the compression seal created by faucet washers, leading to intermittent leaks that worsen over time if left unaddressed.

How to Fix:

Turn off water supply before tightening components.
Remove the handle to access the packing nut.
Tighten nuts and screws gently using correct faucet washers tools.
Avoid overtightening, which may damage threads.
Inspect faucet washer types for wear during reassembly.
Restore water supply and verify stable, leak-free performance.

High Water Pressure Forcing Seal Failure

Excessively high water pressure can affect internal seals and faucet washers, leading to premature wear. When pressure exceeds recommended levels, washers compress beyond capacity, causing distortion and reduced sealing ability. Persistent high pressure also accelerates deterioration of other faucet Repair Parts, resulting in leaks even after component replacement.

How to Fix:

Measure water pressure using a pressure gauge.
Install a pressure regulator if pressure is excessive.
Replace damaged faucet washers after adjusting pressure.
Inspect internal seals and gaskets for pressure damage.
Confirm stable operation without dripping under normal flow.

Faulty Cartridge Leading to Constant Dripping

Modern faucets often use cartridge mechanisms instead of compression washers. When a cartridge becomes worn, cracked, or clogged with debris, it fails to regulate water flow properly. This results in persistent dripping even when handles are fully closed. Cartridges may also cause uneven temperature control and reduced water efficiency.

How to Fix:

Shut off water supply lines beneath the sink.
Remove handle and decorative caps carefully.
Extract the faulty cartridge using appropriate faucet washers tools.
Match replacement cartridge precisely to model specifications.
Install securely without forcing alignment.
Restore supply and verify smooth flow and shutoff performance.

Deteriorated Seals and Gaskets Allowing Leaks

Seals and gaskets are critical components in maintaining watertight connections within faucet assemblies. Over time, rubber and synthetic materials dry out, crack, or lose elasticity. When these components fail, water seeps through joints and connections. Even newly installed faucet washers cannot compensate for deteriorated surrounding seals.

How to Fix:

Disassemble the faucet carefully to access sealing areas.
Inspect all visible seals and gaskets thoroughly.
Replace damaged pieces using compatible faucet Repair Parts.
Apply plumber’s grease to enhance flexibility and sealing.
Ensure all connections are aligned before tightening.
Test faucet under normal pressure for leakage signs.

Improper Installation Causing Recurring Faucet Leaks

Leaks can occur when a faucet is installed incorrectly, even if all components are new. Misaligned washers, loose stems, or improperly seated cartridges prevent a tight seal, causing persistent drips. Incorrect torque on nuts or uneven connections can load faucet washers and seals, leading to repeated failures despite previous repairs. Proper alignment is essential for leak-free operation.

How to Fix:

Turn off water supply before adjustments.
Disassemble the faucet and inspect all internal parts.
Realign washers, stems, and cartridges carefully.
Tighten nuts to the manufacturer's recommended torque.
Reinstall the faucet and check for leaks under normal flow.
Replace damaged washers or seals during reassembly.

Mineral Buildup Affecting Faucet Performance and Flow

Hard water can cause mineral deposits to accumulate on faucet components, including washers, cartridges, and valve seats. Over time, these deposits restrict water flow, corrode metal parts, and prevent washers from forming a proper seal. Mineral buildup increases friction, accelerates wear, and often causes persistent dripping or inconsistent water pressure.

How to Fix:

Turn off water supply before cleaning.
Remove affected faucet components carefully.
Soak washers, cartridges, and seats in vinegar or descaling solution.
Scrub mineral deposits with a soft brush.
Rinse thoroughly and reinstall cleaned parts.
Replace severely corroded parts with compatible faucet Repair Parts.

Conclusion: Fix Leaks Early and Protect Your Plumbing Investment

Solving a leaking faucet promptly helps prevent water waste, structural damage, and rising utility costs. Most issues stem from worn faucet washers, damaged seals, or failing internal components that can be resolved with proper inspection and faucet washer replacement. Using the correct faucet washers and tools and selecting suitable faucet washer types ensures durable, professional results. Regular maintenance and timely replacement of faucet repair parts improve system efficiency, reduce unexpected downtime, and support consistent plumbing performance in commercial settings.

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FAQ’s

1. Do you have to turn the water off if changing a faucet?

Yes, always turn off the water supply before changing a faucet to prevent leaks, flooding, and potential water damage.

2. How do I get my faucet to stop dripping?

To stop a dripping faucet, turn off water, replace worn faucet washers, check O-rings, tighten parts, and inspect seals.